mitkBaseProcess.cpp
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00001 /*========================================================================= 00002 00003 Program: Medical Imaging & Interaction Toolkit 00004 Language: C++ 00005 Date: $Date$ 00006 Version: $Revision$ 00007 00008 Copyright (c) German Cancer Research Center, Division of Medical and 00009 Biological Informatics. All rights reserved. 00010 See MITKCopyright.txt or https://www.mitk.org/copyright.html for details. 00011 00012 This software is distributed WITHOUT ANY WARRANTY; without even 00013 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 00014 PURPOSE. See the above copyright notices for more information. 00015 00016 =========================================================================*/ 00017 00018 #include "mitkBaseProcess.h" 00019 #include "mitkBaseData.h" 00020 00021 00022 #define MITK_WEAKPOINTER_PROBLEM_WORKAROUND_ENABLED 00023 00024 mitk::BaseProcess::BaseProcess() : m_Unregistering(false), m_CalculatingExternalReferenceCount(false), m_ExternalReferenceCount(-1) 00025 { 00026 00027 } 00028 00029 mitk::BaseProcess::~BaseProcess() 00030 { 00031 00032 } 00033 00034 int mitk::BaseProcess::GetExternalReferenceCount() const 00035 { 00036 if(m_CalculatingExternalReferenceCount==false) //this is only needed because a smart-pointer to m_Outputs (private!!) must be created by calling GetOutputs. 00037 { 00038 m_CalculatingExternalReferenceCount = true; 00039 00040 m_ExternalReferenceCount = -1; 00041 00042 DataObjectPointerArray& outputs = const_cast<mitk::BaseProcess*>(this)->GetOutputs(); 00043 00044 int realReferenceCount = GetReferenceCount(); 00045 00046 unsigned int idx; 00047 for (idx = 0; idx < outputs.size(); ++idx) 00048 { 00049 //references of outputs that are not referenced from someone else (reference additional to the reference from this BaseProcess object) are interpreted as non-existent 00050 if((outputs[idx]) && (outputs[idx]->GetReferenceCount()==1)) 00051 --realReferenceCount; 00052 } 00053 m_ExternalReferenceCount = realReferenceCount; 00054 if(m_ExternalReferenceCount<0) 00055 m_ExternalReferenceCount=0; 00056 } 00057 else 00058 return -1; 00059 m_CalculatingExternalReferenceCount = false; //do not move in if-part!!! 00060 return m_ExternalReferenceCount; 00061 } 00062 00063 void mitk::BaseProcess::UnRegister() const 00064 { 00065 #ifdef MITK_WEAKPOINTER_PROBLEM_WORKAROUND_ENABLED 00066 if((m_Unregistering==false) && (m_CalculatingExternalReferenceCount==false)) 00067 { 00068 m_Unregistering=true; 00069 00070 int realReferenceCount = GetExternalReferenceCount()-1; //-1 because someone is trying to unregister us 00071 if(realReferenceCount<0) 00072 m_ExternalReferenceCount=realReferenceCount=0; 00073 00074 if(realReferenceCount==0) 00075 { 00076 DataObjectPointerArray& outputs = const_cast<mitk::BaseProcess*>(this)->GetOutputs(); 00077 //disconnect all outputs from us 00078 //size of outputs will not change until the very last output 00079 //is removed, because we remove from front to back 00080 unsigned int idx; 00081 for (idx = 0; idx < outputs.size(); ++idx) 00082 { 00083 const_cast<mitk::BaseProcess*>(this)->RemoveOutput(outputs[idx]); 00084 } 00085 //now the referenceCount should be one! 00086 int testReferenceCount=GetReferenceCount(); 00087 if(testReferenceCount!=1) 00088 { 00089 itkWarningMacro(<<"Reference count of process object unexpectedly " 00090 << "not 1 before final unregister but " << testReferenceCount); 00091 } 00092 } 00093 m_Unregistering=false; 00094 } 00095 else 00096 { 00097 if(GetReferenceCount()==1) 00098 { 00099 //the calling UnRegister will do the last cleanup 00100 return; 00101 } 00102 } 00103 #endif 00104 Superclass::UnRegister(); 00105 } 00106 00112 void mitk::BaseProcess::SetNthOutput(unsigned int idx, itk::DataObject *output) 00113 { 00114 #ifdef MITK_WEAKPOINTER_PROBLEM_WORKAROUND_ENABLED 00115 output = dynamic_cast<mitk::BaseData*>(output); 00116 00117 // does this change anything? 00118 if ( idx < GetOutputs().size() && output == GetOutputs()[idx]) 00119 { 00120 return; 00121 } 00122 00123 if (output) 00124 { 00125 dynamic_cast<mitk::BaseData*>(output)->ConnectSource(this, idx); 00126 } 00127 #endif 00128 this->Register(); 00129 Superclass::SetNthOutput(idx, output); 00130 this->UnRegister(); 00131 } 00132 00137 void mitk::BaseProcess::AddOutput(itk::DataObject *output) 00138 { 00139 #ifdef MITK_WEAKPOINTER_PROBLEM_WORKAROUND_ENABLED 00140 unsigned int idx=0; 00141 00142 output = dynamic_cast<mitk::BaseData*>(output); 00143 00144 if (output) 00145 { 00146 dynamic_cast<mitk::BaseData*>(output)->ConnectSource(this, idx); 00147 } 00148 #endif 00149 Superclass::AddOutput(output); 00150 00151 }
